Question

Find a^3 + b^3 if a+b=5 & a * b=2

Answer 1

cube both sides of a+b=5
then expand and factor a bit

Answer 2

Hint from @anwar

a+b =5

Cube both sides

(a+b)^3 =5^3 which gives

a^3 + 3a^2b + 3ab^2 + b^3 =

a^3 +b^3 +3ab*(a+b) = 125

put the values of ab and a+b and

solve for the value of a^3 + b^3.

Answer 3

Post what you get, okay?

@Cherryboa